<template>
  <div>
    <div id="app">
      <div>
        <p>请选择你要购买的书籍</p>
        <ul v-for="(item,index) in arr" :key="index">
          <li>
            {{ item.name }}
            <button @click.prevent="add(index)">买书</button>
          </li>
        </ul>
        <table border="1" width="500" cellspacing="0">
          <tr>
            <th>序号</th>
            <th>书名</th>
            <th>单价</th>
            <th>数量</th>
            <th>合计</th>
          </tr>
          <tr v-for="(item,index) in arr" :key="item.name">
            <td>{{index+1}}</td>
            <td>{{item.name}}</td>
            <td>{{item.price}}</td>
            <td>{{item.count}}</td>
            <td>{{item.count * item.price}}</td>
           
          </tr>
        </table>
        <p>总价格为:</p>
      </div>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      arr: [
        {
          name: "水浒传",
          price: 107,
          count: 0,
        },
        {
          name: "西游记",
          price: 192,
          count: 0,
        },
        {
          name: "三国演义",
          price: 219,
          count: 0,
        },
        {
          name: "红楼梦",
          price: 178,
          count: 0,
        },
      ],
    }
  },
  methods: {
    add(id){
    this.arr[id].count++
    }
  },
}
</script>

<style></style>
